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<pre><span class="comment"> /****************************************************************************
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 #include &lt;QtGui&gt;

 #include &quot;iconpreviewarea.h&quot;
 #include &quot;iconsizespinbox.h&quot;
 #include &quot;imagedelegate.h&quot;
 #include &quot;mainwindow.h&quot;

 MainWindow::MainWindow()
 {
     centralWidget = new QWidget;
     setCentralWidget(centralWidget);

     createPreviewGroupBox();
     createImagesGroupBox();
     createIconSizeGroupBox();

     createActions();
     createMenus();
     createContextMenu();

     QGridLayout *mainLayout = new QGridLayout;
     mainLayout-&gt;addWidget(previewGroupBox, 0, 0, 1, 2);
     mainLayout-&gt;addWidget(imagesGroupBox, 1, 0);
     mainLayout-&gt;addWidget(iconSizeGroupBox, 1, 1);
     centralWidget-&gt;setLayout(mainLayout);

     setWindowTitle(tr(&quot;Icons&quot;));
     checkCurrentStyle();
     otherRadioButton-&gt;click();

     resize(minimumSizeHint());
 }

 void MainWindow::about()
 {
     QMessageBox::about(this, tr(&quot;About Icons&quot;),
             tr(&quot;The &lt;b&gt;Icons&lt;/b&gt; example illustrates how Qt renders an icon in &quot;
                &quot;different modes (active, normal, disabled, and selected) and &quot;
                &quot;states (on and off) based on a set of images.&quot;));
 }

 void MainWindow::changeStyle(bool checked)
 {
     if (!checked)
         return;

     QAction *action = qobject_cast&lt;QAction *&gt;(sender());
     QStyle *style = QStyleFactory::create(action-&gt;data().toString());
     Q_ASSERT(style);
     QApplication::setStyle(style);

     smallRadioButton-&gt;setText(tr(&quot;Small (%1 x %1)&quot;)
             .arg(style-&gt;pixelMetric(QStyle::PM_SmallIconSize)));
     largeRadioButton-&gt;setText(tr(&quot;Large (%1 x %1)&quot;)
             .arg(style-&gt;pixelMetric(QStyle::PM_LargeIconSize)));
     toolBarRadioButton-&gt;setText(tr(&quot;Toolbars (%1 x %1)&quot;)
             .arg(style-&gt;pixelMetric(QStyle::PM_ToolBarIconSize)));
     listViewRadioButton-&gt;setText(tr(&quot;List views (%1 x %1)&quot;)
             .arg(style-&gt;pixelMetric(QStyle::PM_ListViewIconSize)));
     iconViewRadioButton-&gt;setText(tr(&quot;Icon views (%1 x %1)&quot;)
             .arg(style-&gt;pixelMetric(QStyle::PM_IconViewIconSize)));
     tabBarRadioButton-&gt;setText(tr(&quot;Tab bars (%1 x %1)&quot;)
             .arg(style-&gt;pixelMetric(QStyle::PM_TabBarIconSize)));

     changeSize();
 }

 void MainWindow::changeSize(bool checked)
 {
     if (!checked)
         return;

     int extent;

     if (otherRadioButton-&gt;isChecked()) {
         extent = otherSpinBox-&gt;value();
     } else {
         QStyle::PixelMetric metric;

         if (smallRadioButton-&gt;isChecked()) {
             metric = QStyle::PM_SmallIconSize;
         } else if (largeRadioButton-&gt;isChecked()) {
             metric = QStyle::PM_LargeIconSize;
         } else if (toolBarRadioButton-&gt;isChecked()) {
             metric = QStyle::PM_ToolBarIconSize;
         } else if (listViewRadioButton-&gt;isChecked()) {
             metric = QStyle::PM_ListViewIconSize;
         } else if (iconViewRadioButton-&gt;isChecked()) {
             metric = QStyle::PM_IconViewIconSize;
         } else {
             metric = QStyle::PM_TabBarIconSize;
         }
         extent = QApplication::style()-&gt;pixelMetric(metric);
     }
     previewArea-&gt;setSize(QSize(extent, extent));
     otherSpinBox-&gt;setEnabled(otherRadioButton-&gt;isChecked());
 }

 void MainWindow::changeIcon()
 {
     QIcon icon;

     for (int row = 0; row &lt; imagesTable-&gt;rowCount(); ++row) {
         QTableWidgetItem *item0 = imagesTable-&gt;item(row, 0);
         QTableWidgetItem *item1 = imagesTable-&gt;item(row, 1);
         QTableWidgetItem *item2 = imagesTable-&gt;item(row, 2);

         if (item0-&gt;checkState() == Qt::Checked) {
             QIcon::Mode mode;
             if (item1-&gt;text() == tr(&quot;Normal&quot;)) {
                 mode = QIcon::Normal;
             } else if (item1-&gt;text() == tr(&quot;Active&quot;)) {
                 mode = QIcon::Active;
             } else if (item1-&gt;text() == tr(&quot;Disabled&quot;)) {
                 mode = QIcon::Disabled;
             } else {
                 mode = QIcon::Selected;
             }

             QIcon::State state;
             if (item2-&gt;text() == tr(&quot;On&quot;)) {
                 state = QIcon::On;
             } else {
                 state = QIcon::Off;
             }

             QString fileName = item0-&gt;data(Qt::UserRole).toString();
             QImage image(fileName);
             if (!image.isNull())
                 icon.addPixmap(QPixmap::fromImage(image), mode, state);
         }
     }

     previewArea-&gt;setIcon(icon);
 }

 void MainWindow::addImages()
 {
     QStringList fileNames = QFileDialog::getOpenFileNames(this,
                                     tr(&quot;Open Images&quot;), &quot;&quot;,
                                     tr(&quot;Images (*.png *.xpm *.jpg);;&quot;
                                        &quot;All Files (*)&quot;));
     if (!fileNames.isEmpty()) {
         foreach (QString fileName, fileNames) {
             int row = imagesTable-&gt;rowCount();
             imagesTable-&gt;setRowCount(row + 1);

             QString imageName = QFileInfo(fileName).baseName();
             QTableWidgetItem *item0 = new QTableWidgetItem(imageName);
             item0-&gt;setData(Qt::UserRole, fileName);
             item0-&gt;setFlags(item0-&gt;flags() &amp; ~Qt::ItemIsEditable);

             QTableWidgetItem *item1 = new QTableWidgetItem(tr(&quot;Normal&quot;));
             QTableWidgetItem *item2 = new QTableWidgetItem(tr(&quot;Off&quot;));

             if (guessModeStateAct-&gt;isChecked()) {
                 if (fileName.contains(&quot;_act&quot;)) {
                     item1-&gt;setText(tr(&quot;Active&quot;));
                 } else if (fileName.contains(&quot;_dis&quot;)) {
                     item1-&gt;setText(tr(&quot;Disabled&quot;));
                 } else if (fileName.contains(&quot;_sel&quot;)) {
                     item1-&gt;setText(tr(&quot;Selected&quot;));
                 }

                 if (fileName.contains(&quot;_on&quot;))
                     item2-&gt;setText(tr(&quot;On&quot;));
             }

             imagesTable-&gt;setItem(row, 0, item0);
             imagesTable-&gt;setItem(row, 1, item1);
             imagesTable-&gt;setItem(row, 2, item2);
             imagesTable-&gt;openPersistentEditor(item1);
             imagesTable-&gt;openPersistentEditor(item2);

             item0-&gt;setCheckState(Qt::Checked);
         }
     }
 }

 void MainWindow::removeAllImages()
 {
     imagesTable-&gt;setRowCount(0);
     changeIcon();
 }

 void MainWindow::createPreviewGroupBox()
 {
     previewGroupBox = new QGroupBox(tr(&quot;Preview&quot;));

     previewArea = new IconPreviewArea;

     QVBoxLayout *layout = new QVBoxLayout;
     layout-&gt;addWidget(previewArea);
     previewGroupBox-&gt;setLayout(layout);
 }

 void MainWindow::createImagesGroupBox()
 {
     imagesGroupBox = new QGroupBox(tr(&quot;Images&quot;));

     imagesTable = new QTableWidget;
     imagesTable-&gt;setSelectionMode(QAbstractItemView::NoSelection);
     imagesTable-&gt;setItemDelegate(new ImageDelegate(this));

     QStringList labels;
     labels &lt;&lt; tr(&quot;Image&quot;) &lt;&lt; tr(&quot;Mode&quot;) &lt;&lt; tr(&quot;State&quot;);

     imagesTable-&gt;horizontalHeader()-&gt;setDefaultSectionSize(90);
     imagesTable-&gt;setColumnCount(3);
     imagesTable-&gt;setHorizontalHeaderLabels(labels);
     imagesTable-&gt;horizontalHeader()-&gt;setResizeMode(0, QHeaderView::Stretch);
     imagesTable-&gt;horizontalHeader()-&gt;setResizeMode(1, QHeaderView::Fixed);
     imagesTable-&gt;horizontalHeader()-&gt;setResizeMode(2, QHeaderView::Fixed);
     imagesTable-&gt;verticalHeader()-&gt;hide();

     connect(imagesTable, SIGNAL(itemChanged(QTableWidgetItem *)),
             this, SLOT(changeIcon()));

     QVBoxLayout *layout = new QVBoxLayout;
     layout-&gt;addWidget(imagesTable);
     imagesGroupBox-&gt;setLayout(layout);
 }

 void MainWindow::createIconSizeGroupBox()
 {
     iconSizeGroupBox = new QGroupBox(tr(&quot;Icon Size&quot;));

     smallRadioButton = new QRadioButton;
     largeRadioButton = new QRadioButton;
     toolBarRadioButton = new QRadioButton;
     listViewRadioButton = new QRadioButton;
     iconViewRadioButton = new QRadioButton;
     tabBarRadioButton = new QRadioButton;
     otherRadioButton = new QRadioButton(tr(&quot;Other:&quot;));

     otherSpinBox = new IconSizeSpinBox;
     otherSpinBox-&gt;setRange(8, 128);
     otherSpinBox-&gt;setValue(64);

     connect(smallRadioButton, SIGNAL(toggled(bool)),
             this, SLOT(changeSize(bool)));
     connect(largeRadioButton, SIGNAL(toggled(bool)),
             this, SLOT(changeSize(bool)));
     connect(toolBarRadioButton, SIGNAL(toggled(bool)),
             this, SLOT(changeSize(bool)));
     connect(listViewRadioButton, SIGNAL(toggled(bool)),
             this, SLOT(changeSize(bool)));
     connect(iconViewRadioButton, SIGNAL(toggled(bool)),
             this, SLOT(changeSize(bool)));
     connect(tabBarRadioButton, SIGNAL(toggled(bool)),
             this, SLOT(changeSize(bool)));
     connect(otherRadioButton, SIGNAL(toggled(bool)),
             this, SLOT(changeSize(bool)));
     connect(otherSpinBox, SIGNAL(valueChanged(int)), this, SLOT(changeSize()));

     QHBoxLayout *otherSizeLayout = new QHBoxLayout;
     otherSizeLayout-&gt;addWidget(otherRadioButton);
     otherSizeLayout-&gt;addWidget(otherSpinBox);
     otherSizeLayout-&gt;addStretch();

     QGridLayout *layout = new QGridLayout;
     layout-&gt;addWidget(smallRadioButton, 0, 0);
     layout-&gt;addWidget(largeRadioButton, 1, 0);
     layout-&gt;addWidget(toolBarRadioButton, 2, 0);
     layout-&gt;addWidget(listViewRadioButton, 0, 1);
     layout-&gt;addWidget(iconViewRadioButton, 1, 1);
     layout-&gt;addWidget(tabBarRadioButton, 2, 1);
     layout-&gt;addLayout(otherSizeLayout, 3, 0, 1, 2);
     layout-&gt;setRowStretch(4, 1);
     iconSizeGroupBox-&gt;setLayout(layout);
 }

 void MainWindow::createActions()
 {
     addImagesAct = new QAction(tr(&quot;&amp;Add Images...&quot;), this);
     addImagesAct-&gt;setShortcut(tr(&quot;Ctrl+A&quot;));
     connect(addImagesAct, SIGNAL(triggered()), this, SLOT(addImages()));

     removeAllImagesAct = new QAction(tr(&quot;&amp;Remove All Images&quot;), this);
     removeAllImagesAct-&gt;setShortcut(tr(&quot;Ctrl+R&quot;));
     connect(removeAllImagesAct, SIGNAL(triggered()),
             this, SLOT(removeAllImages()));

     exitAct = new QAction(tr(&quot;&amp;Quit&quot;), this);
     exitAct-&gt;setShortcut(tr(&quot;Ctrl+Q&quot;));
     connect(exitAct, SIGNAL(triggered()), this, SLOT(close()));

     styleActionGroup = new QActionGroup(this);
     foreach (QString styleName, QStyleFactory::keys()) {
         QAction *action = new QAction(styleActionGroup);
         action-&gt;setText(tr(&quot;%1 Style&quot;).arg(styleName));
         action-&gt;setData(styleName);
         action-&gt;setCheckable(true);
         connect(action, SIGNAL(triggered(bool)), this, SLOT(changeStyle(bool)));
     }

     guessModeStateAct = new QAction(tr(&quot;&amp;Guess Image Mode/State&quot;), this);
     guessModeStateAct-&gt;setCheckable(true);
     guessModeStateAct-&gt;setChecked(true);

     aboutAct = new QAction(tr(&quot;&amp;About&quot;), this);
     connect(aboutAct, SIGNAL(triggered()), this, SLOT(about()));

     aboutQtAct = new QAction(tr(&quot;About &amp;Qt&quot;), this);
     connect(aboutQtAct, SIGNAL(triggered()), qApp, SLOT(aboutQt()));
 }

 void MainWindow::createMenus()
 {
     fileMenu = menuBar()-&gt;addMenu(tr(&quot;&amp;File&quot;));
     fileMenu-&gt;addAction(addImagesAct);
     fileMenu-&gt;addAction(removeAllImagesAct);
     fileMenu-&gt;addSeparator();
     fileMenu-&gt;addAction(exitAct);

     viewMenu = menuBar()-&gt;addMenu(tr(&quot;&amp;View&quot;));
     foreach (QAction *action, styleActionGroup-&gt;actions())
         viewMenu-&gt;addAction(action);
     viewMenu-&gt;addSeparator();
     viewMenu-&gt;addAction(guessModeStateAct);

     menuBar()-&gt;addSeparator();

     helpMenu = menuBar()-&gt;addMenu(tr(&quot;&amp;Help&quot;));
     helpMenu-&gt;addAction(aboutAct);
     helpMenu-&gt;addAction(aboutQtAct);
 }

 void MainWindow::createContextMenu()
 {
     imagesTable-&gt;setContextMenuPolicy(Qt::ActionsContextMenu);
     imagesTable-&gt;addAction(addImagesAct);
     imagesTable-&gt;addAction(removeAllImagesAct);
 }

 void MainWindow::checkCurrentStyle()
 {
     foreach (QAction *action, styleActionGroup-&gt;actions()) {
         QString styleName = action-&gt;data().toString();
         QStyle *candidate = QStyleFactory::create(styleName);
         Q_ASSERT(candidate);
         if (candidate-&gt;metaObject()-&gt;className()
                 == QApplication::style()-&gt;metaObject()-&gt;className()) {
             action-&gt;trigger();
             return;
         }
         delete candidate;
     }
 }</pre>
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